Sphalerite   Empire State Mine, Level 3,861, Balmat, St. Lawrence County, New York.  Collected 2023.  This thumbnail sized piece measures 2.3 x 2.1 x 1.3 cm.  Bright yellow transparent crystals to 1 cm each.  No damage to main face crystals.  Contacts along edges.  Fluorescent in short, mid and long wave ultraviolet light.  Nice example $225